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doomrobo
on Sept 18, 2015
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The Hardest chess problem in the world?
Is a castle legal in this case?
dalke
on Sept 18, 2015
[–]
No. Castling can only occur if the king has not moved. By convention, white's pieces start at the bottom of the depicted board - the first row. In this puzzle, the king is in the last row, which means it has moved at least 7 steps.
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